Over med/low heat in a large pan, caramelize onions for about 30 minutes. In a bowl, whisk sour cream, vegetable oil and eggs. In a separate bowl whisk together flour, parmesan, sugar, rosemary, thyme, baking powder lemon zest, salt, pepper and baking soda.

Add in the onions and fold the wet ingredients into the dry and mix to combine.

Pour mixture into a 9x5" loaf pan that has been lined with parchment paper on the bottom and all sides (let the sides hang out a little longer to make it easier to remove) and sprayed with cooking spray.

Cook in a preheated 350 degree oven for about 40-50 minutes or until a toothpick comes out of the center clean. Let cool about 1 hour then remove. Enjoy.